SandrineS Hello Jet Thank you for your request. You can buy a 24h ticket in Zurich. If you want to buy it on the SBB Mobile App, then you have to specify “one way and return” in the ticket option. You can find more information here: 24h-tickets of the Zürcher Verkehrsverbund – ZVV Greetings, SandrineS
potato-swiss Download the zvv app and do it from there, if you have a Swiss pass you can link it on the app as well.